web--6.验证码

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1 servlet

1.1 CreateImgservlet

@WebServlet("/CreateImgServlet")public classCreateImgServlet extends HttpServlet {   private static final long serialVersionUID= 1L;         publicCreateImgServlet() {        super();   }    protected void doGet(HttpServletRequestrequest,HttpServletResponse response)throwsServletException, IOException {      //禁用缓存      response.setHeader("Pragma","No-cache");      response.setHeader("Cache-Control","No-cache");      response.setDateHeader("Expires",0);      //设置服务器响应的类型是一张图片      response.setContentType("image/jpeg");      int width = 86;                             //指定验证码的宽度      int height = 22;                            //指定验证码的高度      BufferedImageimage= newBufferedImage(width,height,BufferedImage.TYPE_INT_RGB);      ImgUtiliu =  new ImgUtil();      image = iu.creatCheckCode(width, height, BufferedImage.TYPE_INT_RGB);      request.getSession(true).setAttribute("CODE", iu.getCheckCode());      ImageIO.write(image, "JPEG", response.getOutputStream());   }    protected voiddoPost(HttpServletRequest request, HttpServletResponse response) throwsServletException, IOException {      doGet(request, response);   } }

1.2 ImgUtil

public classImgUtil {   private String checkCode;     public String getCheckCode() {      return checkCode;   }    public  void setCheckCode(String checkCode) {      this.checkCode = checkCode;   }       // 获取随机颜色      public  Color getRandColor(int s, int e) {         Randomrandom= newRandom();         if (s > 255) s = 255;         if (e > 255) e = 255;         int r = s + random.nextInt(e - s);   //随机生成RGB颜色中的r值         int g = s + random.nextInt(e - s);   //随机生成RGB颜色中的g值         int b = s + random.nextInt(e - s);   //随机生成RGB颜色中的b值         return new Color(r, g, b);      }     public  BufferedImage creatCheckCode(int width,int height,int imageType){      BufferedImageimage= newBufferedImage(width,height,imageType);      Graphicsg = image.getGraphics();                 //获取Graphics类的对象      Graphics2Dg2d= (Graphics2D) g;      Randomrandom= newRandom();                  //实例化一个Random对象      FontmFont= newFont("黑体", Font.BOLD, 17);        //通过Font构造字体      g.setColor(getRandColor(200,250));               //设置颜色      g.fillRect(0, 0, width, height);                     //绘制验证码背景      g.setFont(mFont);                 //设置字体      g.setColor(getRandColor(180,200));     //设置颜色      // 画随机的线条      for (int i = 0; i < 100; i++) {         int x = random.nextInt(width - 1); //生成起始点x轴的坐标         int y = random.nextInt(height - 1);  //生成起始点y轴的坐标         int x1 = random.nextInt(6) + 1; //生成结束点x轴的坐标         int y1 = random.nextInt(12) + 1;  //生成结束点y轴的坐标         BasicStrokebs = new BasicStroke(2f,BasicStroke.CAP_BUTT,                BasicStroke.JOIN_BEVEL);         Line2Dline= newLine2D.Double(x, y, x + x1, y + y1);         g2d.setStroke(bs);         g2d.draw(line);     //绘制直线      }      StringsRand= "";      // 输出随机的验证文字      Stringctmp= "";      int itmp = 0;      for (int i = 0; i < 4; i++) {         if((random.nextInt(2)+1)==1){            itmp = random.nextInt(10) + 48; // 生成0~9的数字            ctmp = String.valueOf((char) itmp);         }else{            itmp = random.nextInt(26) + 65; // 生成A~Z的字母            ctmp = String.valueOf((char) itmp);         }         sRand += ctmp;         Colorcolor= newColor(20 + random.nextInt(110),20 + random                .nextInt(110),20 + random.nextInt(110));         g.setColor(color);    //设置文字颜色         /** **随机缩放文字并将文字旋转指定角度* */         // 将文字旋转指定角度         Graphics2Dg2d_word= (Graphics2D) g;         AffineTransformtrans= newAffineTransform();         trans.rotate(random.nextInt(45) * 3.14 /180, 15 * i + 8, 7);         // 缩放文字         float scaleSize = random.nextFloat() +0.8f;         if (scaleSize > 1f)   scaleSize = 1f;         trans.scale(scaleSize, scaleSize);         g2d_word.setTransform(trans);         /** ********************* */         g.drawString(ctmp, 15 * i + 18, 14);       }      g.dispose();      setCheckCode(sRand);      return image;   } }

1.3 Servlet验证

1.4 JSP页面刷新

2 action

2.1 CheckImgAction

/** * 验证码程序 */public classCheckImgAction extends ActionSupport {    private static final long serialVersionUID= 1L;    @Override   public String execute() throws Exception {      int width = 120;      int height = 30;       // 步骤一绘制一张内存中图片      BufferedImagebufferedImage= newBufferedImage(width,height,            BufferedImage.TYPE_INT_RGB);       // 步骤二图片绘制背景颜色 ---通过绘图对象      Graphicsgraphics= bufferedImage.getGraphics();// 得到画图对象 --- 画笔      // 绘制任何图形之前都必须指定一个颜色      graphics.setColor(getRandColor(200,250));      graphics.fillRect(0, 0, width, height);       // 步骤三绘制边框      graphics.setColor(Color.WHITE);      graphics.drawRect(0, 0, width - 1, height - 1);       // 步骤四四个随机数字      Graphics2Dgraphics2d= (Graphics2D) graphics;      // 设置输出字体      graphics2d.setFont(new Font("宋体", Font.BOLD, 18));       Stringwords= "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890";      // String words=      //"\u7684\u4e00\u4e86\u662f\u6211\u4e0d\u5728\u4eba\u4eec\u6709\u6765\u4ed6\u8fd9\u4e0a\u7740\u4e2a\u5730\u5230\u5927\u91cc\u8bf4\u5c31\u53bb\u5b50\u5f97\u4e5f\u548c\u90a3\u8981\u4e0b\u770b\u5929\u65f6\u8fc7\u51fa\u5c0f\u4e48\u8d77\u4f60\u90fd\u628a\u597d\u8fd8\u591a\u6ca1\u4e3a\u53c8\u53ef\u5bb6\u5b66\u53ea\u4ee5\u4e3b\u4f1a\u6837\u5e74\u60f3\u751f\u540c\u8001\u4e2d\u5341\u4ece\u81ea\u9762\u524d\u5934\u9053\u5b83\u540e\u7136\u8d70\u5f88\u50cf\u89c1\u4e24\u7528\u5979\u56fd\u52a8\u8fdb\u6210\u56de\u4ec0\u8fb9\u4f5c\u5bf9\u5f00\u800c\u5df1\u4e9b\u73b0\u5c71\u6c11\u5019\u7ecf\u53d1\u5de5\u5411\u4e8b\u547d\u7ed9\u957f\u6c34\u51e0\u4e49\u4e09\u58f0\u4e8e\u9ad8\u624b\u77e5\u7406\u773c\u5fd7\u70b9\u5fc3\u6218\u4e8c\u95ee\u4f46\u8eab\u65b9\u5b9e\u5403\u505a\u53eb\u5f53\u4f4f\u542c\u9769\u6253\u5462\u771f\u5168\u624d\u56db\u5df2\u6240\u654c\u4e4b\u6700\u5149\u4ea7\u60c5\u8def\u5206\u603b\u6761\u767d\u8bdd\u4e1c\u5e2d\u6b21\u4eb2\u5982\u88ab\u82b1\u53e3\u653e\u513f\u5e38\u6c14\u4e94\u7b2c\u4f7f\u5199\u519b\u5427\u6587\u8fd0\u518d\u679c\u600e\u5b9a\u8bb8\u5feb\u660e\u884c\u56e0\u522b\u98de\u5916\u6811\u7269\u6d3b\u90e8\u95e8\u65e0\u5f80\u8239\u671b\u65b0\u5e26\u961f\u5148\u529b\u5b8c\u5374\u7ad9\u4ee3\u5458\u673a\u66f4\u4e5d\u60a8\u6bcf\u98ce\u7ea7\u8ddf\u7b11\u554a\u5b69\u4e07\u5c11\u76f4\u610f\u591c\u6bd4\u9636\u8fde\u8f66\u91cd\u4fbf\u6597\u9a6c\u54ea\u5316\u592a\u6307\u53d8\u793e\u4f3c\u58eb\u8005\u5e72\u77f3\u6ee1\u65e5\u51b3\u767e\u539f\u62ff\u7fa4\u7a76\u5404\u516d\u672c\u601d\u89e3\u7acb\u6cb3\u6751\u516b\u96be\u65e9\u8bba\u5417\u6839\u5171\u8ba9\u76f8\u7814\u4eca\u5176\u4e66\u5750\u63a5\u5e94\u5173\u4fe1\u89c9\u6b65\u53cd\u5904\u8bb0\u5c06\u5343\u627e\u4e89\u9886\u6216\u5e08\u7ed3\u5757\u8dd1\u8c01\u8349\u8d8a\u5b57\u52a0\u811a\u7d27\u7231\u7b49\u4e60\u9635\u6015\u6708\u9752\u534a\u706b\u6cd5\u9898\u5efa\u8d76\u4f4d\u5531\u6d77\u4e03\u5973\u4efb\u4ef6\u611f\u51c6\u5f20\u56e2\u5c4b\u79bb\u8272\u8138\u7247\u79d1\u5012\u775b\u5229\u4e16\u521a\u4e14\u7531\u9001\u5207\u661f\u5bfc\u665a\u8868\u591f\u6574\u8ba4\u54cd\u96ea\u6d41\u672a\u573a\u8be5\u5e76\u5e95\u6df1\u523b\u5e73\u4f1f\u5fd9\u63d0\u786e\u8fd1\u4eae\u8f7b\u8bb2\u519c\u53e4\u9ed1\u544a\u754c\u62c9\u540d\u5440\u571f\u6e05\u9633\u7167\u529e\u53f2\u6539\u5386\u8f6c\u753b\u9020\u5634\u6b64\u6cbb\u5317\u5fc5\u670d\u96e8\u7a7f\u5185\u8bc6\u9a8c\u4f20\u4e1a\u83dc\u722c\u7761\u5174\u5f62\u91cf\u54b1\u89c2\u82e6\u4f53\u4f17\u901a\u51b2\u5408\u7834\u53cb\u5ea6\u672f\u996d\u516c\u65c1\u623f\u6781\u5357\u67aa\u8bfb\u6c99\u5c81\u7ebf\u91ce\u575a\u7a7a\u6536\u7b97\u81f3\u653f\u57ce\u52b3\u843d\u94b1\u7279\u56f4\u5f1f\u80dc\u6559\u70ed\u5c55\u5305\u6b4c\u7c7b\u6e10\u5f3a\u6570\u4e61\u547c\u6027\u97f3\u7b54\u54e5\u9645\u65e7\u795e\u5ea7\u7ae0\u5e2e\u5566\u53d7\u7cfb\u4ee4\u8df3\u975e\u4f55\u725b\u53d6\u5165\u5cb8\u6562\u6389\u5ffd\u79cd\u88c5\u9876\u6025\u6797\u505c\u606f\u53e5\u533a\u8863\u822c\u62a5\u53f6\u538b\u6162\u53d4\u80cc\u7ec6";      Randomrandom= newRandom();// 生成随机数      // 定义StringBuffer      StringBuffersb = new StringBuffer();      // 定义x坐标      int x = 10;      for (int i = 0; i < 4; i++) {         // 随机颜色         graphics2d.setColor(new Color(20 + random.nextInt(110), 20 + random                .nextInt(110),20 + random.nextInt(110)));         // 旋转 -30 --- 30度         int jiaodu = random.nextInt(60) - 30;         // 换算弧度         double theta = jiaodu * Math.PI / 180;          // 生成一个随机数字         int index = random.nextInt(words.length()); // 生成随机数 0 到 length - 1         // 获得字母数字         char c = words.charAt(index);         sb.append(c);         // 将c 输出到图片         graphics2d.rotate(theta, x, 20);         graphics2d.drawString(String.valueOf(c), x, 20);         graphics2d.rotate(-theta, x, 20);         x += 30;      }       // 将生成的字母存入到session中      ServletActionContext.getRequest().getSession()            .setAttribute("checkcode",sb.toString());       // 步骤五绘制干扰线      graphics.setColor(getRandColor(160,200));      int x1;      int x2;      int y1;      int y2;      for (int i = 0; i < 30; i++) {         x1 = random.nextInt(width);         x2 = random.nextInt(12);         y1 = random.nextInt(height);         y2 = random.nextInt(12);         graphics.drawLine(x1, y1, x1 + x2, x2 + y2);      }       // 将上面图片输出到浏览器 ImageIO      graphics.dispose();// 释放资源      ImageIO.write(bufferedImage, "jpg",ServletActionContext.getResponse()            .getOutputStream());      return NONE;   }    /**    * 取其某一范围的color    *    * @param fc        int范围参数1    * @param bc        int范围参数2    * @return Color    */   private Color getRandColor(int fc, int bc) {      // 取其随机颜色      Randomrandom= newRandom();      if (fc > 255) {         fc = 255;      }      if (bc > 255) {         bc = 255;      }      int r = fc + random.nextInt(bc - fc);      int g = fc + random.nextInt(bc - fc);      int b = fc + random.nextInt(bc - fc);      return new Color(r, g, b);   }}

2.2 Action验证

2.3 Jsp页面刷新

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